US9401324B2 - Semiconductor device having an on die termination circuit - Google Patents
Semiconductor device having an on die termination circuit Download PDFInfo
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- US9401324B2 US9401324B2 US14/023,962 US201314023962A US9401324B2 US 9401324 B2 US9401324 B2 US 9401324B2 US 201314023962 A US201314023962 A US 201314023962A US 9401324 B2 US9401324 B2 US 9401324B2
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Definitions
- Embodiments described herein generally relate to a semiconductor device.
- the semiconductor device uses an ODT (On Die Termination) circuit as its IO termination in some cases.
- ODT On Die Termination
- FIG. 1 is a block diagram illustrating a system configuration of a semiconductor device according to a first embodiment
- FIG. 2A , FIG. 2B , and FIG. 2C are block diagrams each illustrating a schematic configuration example of a semiconductor chip used in a NAND memory in FIG. 1 ;
- FIG. 3A is a plan view illustrating a configuration example of a P-type transistor P 1 and a resistor R 1 in FIG. 2A and FIG. 2B , and a P-type transistor P 2 and a resistor R 3 in FIG. 2B and FIG. 2C
- FIG. 3B is a cross-sectional view cut along a wiring H 1 in FIG. 3A ;
- FIG. 4 is a plan view illustrating a configuration example of a P-type transistor and a resistor of an ODT circuit applied to a semiconductor device according to a second embodiment
- FIG. 5A is a plan view illustrating a configuration example of a P-type transistor and a resistor of an ODT circuit applied to a semiconductor device according to a third embodiment
- FIG. 5B is a cross-sectional view cut along a wiring H 11 in FIG. 5A ;
- FIG. 6A is a plan view illustrating a configuration example of P-type transistors and resistors of an ODT circuit applied to a semiconductor device according to a fourth embodiment
- FIG. 6B is a cross-sectional view cut along a wiring H 21 A in FIG. 6A ;
- FIG. 7 is a plan view illustrating a configuration example of P-type transistors and resistors of an ODT circuit applied to a semiconductor device according to a fifth embodiment
- FIG. 8A is a cross-sectional view illustrating a system configuration of a semiconductor device according to a sixth embodiment
- FIG. 8B is a block diagram illustrating a connection state of an ODT circuit 11 A on a semiconductor chip PE 0 in FIG. 8A
- FIG. 8C is a block diagram illustrating a connection state of an ODT circuit 11 B on each of semiconductor chips PE 1 to PE 7 in FIG. 8A ;
- FIG. 9 is a cross-sectional view illustrating a system configuration of a semiconductor device according to a seventh embodiment.
- FIG. 10 is a cross-sectional view illustrating a system configuration of a semiconductor device according to an eighth embodiment.
- a transistor, a lower-layer wiring, and an upper-layer wiring are provided on a semiconductor chip.
- the lower-layer wiring is connected to a diffusion layer of the transistor, and drawn outside the diffusion layer.
- the upper-layer wiring is drawn from a pad electrode formed on the semiconductor chip and connected to the lower-layer wiring, and has resistivity lower than that of the lower-layer wiring.
- FIG. 1 is a block diagram illustrating a system configuration of a semiconductor device according to a first embodiment.
- a NAND memory 1 is connected to a controller 3 through a transmission line 2 .
- the controller 3 can perform reading/writing control, block selection, and error correction in the NAND memory 1 .
- the NAND memory 1 uses an ODT circuit 4 as an IO termination.
- the controller 3 uses an ODT circuit 5 as an IO termination.
- the ODT circuit 4 can achieve impedance matching with the transmission line 2 when a signal is inputted to the NAND memory 1 , or limit upper and lower limits of the signal inputted to the NAND memory 1 .
- the ODT circuit 5 can achieve impedance matching with the transmission line 2 when a signal is inputted to the controller 3 , or limit upper and lower limits of a signal inputted to the controller 3 .
- FIG. 2A , FIG. 2B and FIG. 2C are block diagrams each illustrating a schematic configuration example of a semiconductor chip used in the NAND memory in FIG. 1 .
- a pad electrode D 1 is provided in a semiconductor chip B 1 , and the pad electrode D 1 is connected to an ODT circuit 11 , an output buffer 12 , a protective resistor R 0 , and an input circuit 13 , and connected to an internal circuit 14 through the output buffer 12 and the input circuit 13 .
- a memory cell array, a row decoder, and a column decoder in the NAND memory 1 may be provided.
- the ODT circuit 11 includes a P-type transistor P 1 , an N-type transistor N 1 , and resistors R 1 and R 2 .
- the P-type transistor P 1 and the resistor R 1 are connected in series with each other, and the N-type transistor N 1 and the resistor R 2 are connected in series with each other.
- a connection point of the resistors R 1 and R 2 is connected to the pad electrode D 1 .
- a source of the P-type transistor P 1 is connected to a power supply potential VCC, and a source of the N-type transistor N 1 is connected to a ground potential GND.
- the output buffer 12 includes a P-type transistor P 2 and an N-type transistor N 2 .
- a connection point of the P-type transistor P 2 and the N-type transistor N 2 is connected to the pad electrode D 1 .
- a source of the P-type transistor P 2 is connected to the power supply potential VCC, and a source of the N-type transistor N 2 is connected to the ground potential GND.
- the ODT circuit may be also partially used as the output buffer.
- the pad electrode D 1 when a signal is inputted to the pad electrode D 1 , the P-type transistor P 2 and the N-type transistor N 2 are turned off. In addition, when the P-type transistor P 1 and the N-type transistor N 1 are turned on, the pad electrode D 1 is set to an intermediate potential between the power supply potential VCC and the ground potential GND. At this time, when a combined resistance value of the resistors R 1 and R 2 is conformed to a resistance value of the transmission line 2 , the impedance matching with the transmission line 2 can be achieved. Therefore, the signal inputted to the pad electrode D 1 through the transmission line 2 can be prevented from being reflected, and the signal can be efficiently transmitted. In addition, the upper and lower limits of the signal inputted to the pad electrode D 1 through the transmission line 2 can be limited by the resistors R 1 and R 2 , and the signal can be reduced in amplitude.
- FIG. 2B illustrates a case where the output buffer 12 also includes transistors and resistor elements connected in series, similar to the ODT circuit.
- the output buffer 12 includes the P-type transistor P 2 , the N-type transistor N 2 , and resistors R 3 and R 4 .
- the P-type transistor P 2 and the resistor R 3 are connected in series with each other, and the N-type transistor N 2 and the resistor R 4 are connected in series with each other.
- a connection point of the resistors R 3 and R 4 is connected to the pad electrode D 1 .
- the source of the P-type transistor P 2 is connected to the power supply potential VCC, and the source of the N-type transistor N 2 is connected to the ground potential GND.
- FIG. 2C illustrates a case where only the output buffer 12 is provided.
- the output buffer 12 includes the P-type transistor P 2 , the N-type transistor N 2 , and the resistors R 3 and R 4 .
- the P-type transistor P 2 and the resistor R 3 are connected in series with each other, and the N-type transistor N 2 and the resistor R 4 are connected in series with each other.
- the connection point of the resistors R 3 and R 4 is connected to the pad electrode D 1 .
- the source of the P-type transistor P 2 is connected to the power supply potential VCC, and the source of the N-type transistor N 2 is connected to the ground potential GND.
- the output buffer may partially function as the ODT.
- FIG. 3A is a plan view illustrating a configuration example of the P-type transistor P 1 and the resistor R 1 in FIG. 2A and FIG. 2B , and the P-type transistor P 2 and the resistor R 3 in FIG. 2B and FIG. 2C
- FIG. 3B is a cross-sectional view cut along a wiring H 1 in FIG. 3A .
- the output buffer having the transistor and the resistor element connected in series has the same configuration as those of the ODT circuit and ODT, so that the ODT circuit is described as a representative below, but the output buffer having the transistor and the resistor element connected in series is included as a target therein, similar to the ODT.
- the semiconductor chip B 1 has a gate electrode G 1 .
- a material of the semiconductor chip B 1 single-crystal silicon can be used, and as a material of the gate electrode G 1 , polycrystal silicon can be used.
- Diffusion layers F 1 and F 2 are provided on both sides of a channel region under the gate electrode G 1 .
- the gate electrode G 1 and the diffusion layers F 1 and F 2 may be used as the P-type transistor P 1 in FIG. 2 .
- the diffusion layer F 1 can compose a drain of the P-type transistor P 1
- the diffusion layer F 2 can compose the source of the P-type transistor P 1 .
- a lower-layer wiring H 1 is formed on the diffusion layer F 1 , and the lower-layer wiring H 1 is drawn outside the diffusion layer F 1 .
- the lower-layer wiring H 1 is connected to the diffusion layer F 1 through a contact T 1 .
- a lower-layer wiring H 2 is formed on the diffusion layer F 2 , and the lower-layer wiring H 2 is connected to the diffusion layer F 2 through a contact T 2 .
- the pad electrode D 1 is provided in the semiconductor chip B 1 , and an upper-layer wiring H 3 is drawn out from the pad electrode D 1 .
- the upper-layer wiring H 3 is connected to the lower-layer wiring H 1 through a contact T 3 .
- the lower-layer wiring H 1 can be made of material having resistivity higher than that of the upper-layer wiring H 3 .
- the lower-layer wiring H 1 may be made of material having a melting point higher than that of the upper-layer wiring H 3 , or the lower-layer wiring H 1 may be made of material having electromigration resistance higher than that of the upper-layer wiring H 3 .
- the lower-layer wiring H 1 can be made of W
- the upper-layer wiring H 3 can be made of Al.
- the lower-layer wiring H 1 drawn outside the diffusion layer F 1 can be used as the resistor R 1 in FIG. 2 .
- the resistor R 1 in FIG. 2 it is not necessary to separately form the resistor element used as the resistor R 1 in FIG. 2 , so that the wiring capacity used for connecting the resistor element can be reduced, and as a result, signal transmission speed can be improved.
- a value of the resistor R 1 can be prevented from varying, and the electromigration can be reduced, so that reliability of the ODT circuit 11 can be improved.
- the resistor R 2 can be configured similarly to the resistor R 1 .
- FIG. 4 is a plan view illustrating a configuration example of a P-type transistor and a resistor in an ODT circuit applied to a semiconductor device according to a second embodiment.
- a lower-layer wiring H 1 A is provided in this ODT circuit instead of the lower-layer wiring H 1 in FIG. 1 .
- the lower-layer wiring H 1 A can employ a folding structure outside the diffusion layer F 1 .
- a resistance value of the lower-layer wiring H 1 A can be increased and a value of the resistor R 1 can be increased.
- FIG. 5A is a plan view illustrating a configuration example of a P-type transistor and a resistor in an ODT circuit applied to a semiconductor device according to a third embodiment
- FIG. 5B is a cross-sectional view cut along a wiring H 11 in FIG. 5A .
- a semiconductor chip B 11 has plural gate electrode G 11 provided in parallel.
- single-crystal silicon can be used, and as a material of the gate electrode G 11 , polycrystal silicon can be used.
- Diffusion layers F 11 and F 12 are provided on both side of a channel region under the gate electrode G 11 .
- the gate electrode G 11 and the diffusion layers F 11 and F 12 can be used as a P-type transistor P 11 in the ODT circuit. At this time, the diffusion layer F 11 can compose a drain of the P-type transistor P 11 , and the diffusion layer F 12 can compose a source of the P-type transistor P 11 .
- a lower-layer wiring H 11 is formed on the diffusion layer F 11 , and the lower-layer wiring H 11 is drawn outside the diffusion layer F 11 .
- the lower-layer wiring H 11 is connected to the diffusion layer F 11 through a contact T 11 .
- a lower-layer wiring H 12 is formed on the diffusion layer F 12 , and the lower-layer wiring H 12 is connected to the diffusion layer F 12 through a contact.
- An upper-layer wiring H 15 is formed on the lower-layer wiring H 12 , and the upper-layer wiring H 15 is connected to the lower-layer wiring H 12 through a contact T 15 .
- a pad electrode D 11 is provided in the semiconductor chip B 11 , and an upper-layer wiring H 13 is drawn out from the pad electrode D 11 .
- the upper-layer wiring H 13 is connected to the lower-layer wiring H 11 through a contact T 13 .
- the lower-layer wiring H 11 can be made of material having resistivity higher than that of the upper-layer wiring H 13 .
- the lower-layer wiring H 11 may be made of material having a melting point higher than that of the upper-layer wiring H 13 , or the lower-layer wiring H 11 may be made of material having electromigration resistance higher than that of the upper-layer wiring H 13 .
- the lower-layer wiring H 11 may be made of W
- the upper-layer wiring H 13 may be made of Al.
- the lower-layer wiring H 11 drawn outside the diffusion layer F 11 can be used as a resistor R 11 connected to the P-type transistor P 11 in series in the ODT circuit.
- a back wiring H 14 to back up the lower-layer wiring H 11 is provided over the diffusion layer F 11 , and the back wiring H 14 is connected to the lower-layer wiring H 11 through a contact T 14 .
- the back wiring H 14 can be made of material having resistivity lower than that of the lower-layer wiring H 11 .
- the back wiring H 14 can be made of Al.
- a back wiring H 15 is provided to back up the lower-layer wiring H 11 , in a section between the resistor R 11 and the diffusion layer F 11 , and the back wiring H 15 is connected to the lower-layer wiring H 11 through a contact T 15 .
- the lower-layer wiring H 11 can be divided to a portion to be acted as the resistor R 11 and a portion not to be acted as the resistor R 11 , so that precision of a value of the resistor R 11 can be improved.
- FIG. 6A is a plan view illustrating a configuration example of P-type transistors and resistors of an ODT circuit applied to a semiconductor device according to a fourth embodiment
- FIG. 6B is a cross-sectional view cut along a wiring H 21 A in FIG. 6A .
- a semiconductor chip B 21 has plural P-type transistor P 21 A, P 21 B, and P 21 C.
- the P-type transistor P 21 A has plural gate electrode G 21 A provided in parallel
- the P-type transistor P 21 B has plural gate electrode G 21 B provided in parallel
- the P-type transistor P 21 C has plural gate electrode G 21 C provided in parallel.
- a material of the semiconductor chip B 21 single-crystal silicon can be used, and as a material of the gate electrodes G 21 A, G 21 B, and G 21 C, polycrystal silicon can be used.
- Diffusion layers F 21 A and F 22 A are provided on both sides of a channel region under the gate electrode G 21 A
- diffusion layers F 21 B and F 22 B are provided on both sides of a channel region under the gate electrode G 21 B
- diffusion layers F 21 C and F 22 C are provided on both sides of a channel region under the gate electrode G 21 C.
- the diffusion layer F 21 A can compose a drain of the P-type transistor P 21 A
- the diffusion layer F 22 A can compose a source of the P-type transistor P 21 A.
- the diffusion layer F 21 B can compose a drain of the P-type transistor P 21 B
- the diffusion layer F 22 B can s compose a source of the P-type transistor P 21 B.
- the diffusion layer F 21 C can compose a drain of the P-type transistor P 21 C
- the diffusion layer F 22 C can compose a source of the P-type transistor P 21 C.
- the lower-layer wiring H 21 A is formed on the diffusion layer F 21 A, and the lower-layer wiring H 21 A is drawn outside the diffusion layer F 21 A.
- the lower-layer wiring H 21 A is connected to the diffusion layer F 21 A through a contact.
- a lower-layer wiring H 21 B is formed on the diffusion layer F 21 B, and the lower-layer wiring H 21 B is drawn outside the diffusion layer F 21 B.
- the lower-layer wiring H 21 B is connected to the diffusion layer F 21 B through a contact.
- a lower-layer wiring H 21 C is formed on the diffusion layer F 21 C, and the lower-layer wiring H 21 C is drawn outside the diffusion layer F 21 C.
- the lower-layer wiring H 21 C is connected to the diffusion layer F 21 C through a contact.
- the lower-layer wirings H 21 A, H 21 B, and H 21 C do not overlap with the gate electrodes G 21 A, G 21 B, and G 21 C, respectively.
- Lower-layer wirings H 22 A, H 22 B, and H 22 C are formed on the diffusion layers F 22 A, F 22 B, and F 22 C, respectively, and the lower-layer wirings H 22 A, H 22 B, and H 22 C are connected to the diffusion layers F 22 A, F 22 B, and F 22 C through contacts, respectively.
- Upper-layer wirings H 25 A, H 25 B, and H 25 C are formed on the lower-layer wirings H 22 A, H 22 B, and H 22 C, respectively, and the upper-layer wirings H 25 A, H 25 B, and H 25 C are connected to the lower-layer wirings H 22 A, H 22 B, and H 22 C, through contacts T 25 A, T 25 B, and T 25 C, respectively.
- a pad electrode D 21 is provided in the semiconductor chip B 21 , and upper-layer wirings H 23 A, H 23 B, and H 23 C are drawn out from the pad electrode D 21 .
- the upper-layer wirings H 23 A, H 23 B, and H 23 C are connected to the lower-layer wirings H 21 A, H 21 B, and H 21 C through contacts T 23 A, T 23 B, and T 23 C, respectively.
- the lower-layer wirings H 21 A, H 21 B, and H 21 C can be made of material having resistivity higher than those of the upper-layer wirings H 23 A, H 23 B, and H 23 C.
- the lower-layer wirings H 21 A, H 21 B, and H 21 C may be made of material having a melting point higher than those of the upper-layer wirings H 23 A, H 23 B, and H 23 C, or the lower-layer wirings H 21 A, H 21 B, and H 21 C may be made of material having electromigration resistance higher than those of the upper-layer wirings H 23 A, H 23 B, and H 23 C.
- the lower-layer wirings H 21 A, H 21 B, and H 21 C can be made of W, and the upper-layer wirings H 23 A, H 23 B, and H 23 C can be made of Al.
- the lower-layer wiring H 21 A drawn outside the diffusion layer F 21 A can be used as a resistor R 21 A connected to the P-type transistor P 21 A in series.
- the lower-layer wiring H 21 B drawn outside the diffusion layer F 21 B can be used as a resistor R 21 B connected to the P-type transistor P 21 B in series.
- the lower-layer wiring H 21 C drawn outside the diffusion layer F 21 C can be used as a resistor R 21 C connected to the P-type transistor P 21 C in series.
- back wirings H 24 A, H 24 B, and H 24 C to back up the lower-layer wirings H 21 A, H 21 B, and H 21 C are provided over the diffusion layers F 21 A, F 21 B, and F 21 C, respectively, and the back wirings H 24 A, H 24 B, and H 24 C are connected to the lower-layer wirings H 21 A, H 21 B, and H 21 C through contacts T 24 A, T 24 B, and T 24 C, respectively.
- the back wirings H 24 A, H 24 B, and H 24 C can be made of material having resistivity lower than those of the lower-layer wirings H 21 A, H 21 B, and H 21 C.
- the back wirings H 24 A, H 24 B, and H 24 C can be made of Al.
- back wirings H 25 A, H 25 B, and H 25 C are provided to back up the lower-layer wirings H 21 A, H 21 B, and H 21 C, in sections between the resistors R 21 A, R 21 B, and R 21 C and the diffusion layers F 21 A, F 21 B, and F 21 C, respectively, and the back wirings H 25 A, H 25 B, and H 25 C are connected to the lower-layer wirings H 21 A, H 21 B, and H 21 C through contacts T 25 A, T 25 B, and T 25 C, respectively.
- strip-shaped base diffusion layers F 23 which are isolated with STIs (Shallow Trench Isolation) Z 21 are formed on the semiconductor chip B 21 , and strip-shaped base wirings H 26 are formed, in a region between the P-type transistors P 21 A, P 21 B, and P 21 C, and the pad electrode D 21 .
- the base wiring H 26 can be made of gate electrode material of the P-type transistors P 21 A, P 21 B, and P 21 C.
- the base diffusion layer F 23 and the base wiring H 26 can be alternately arranged side by side under the lower-layer wirings H 21 A, H 21 B, and H 21 C so as to intersect with the lower-layer wirings H 21 A, H 21 B, and H 21 C at right angles.
- the base diffusion layer F 23 and the base wiring H 26 can be shared by the plural lower-layer wiring H 21 A, H 21 B, and H 21 C.
- the base diffusion layer F 23 and the base wiring H 26 can be configured into an L shape in a bending portion of the lower-layer wirings H 21 A, H 21 B, and H 21 C.
- potentials of the base diffusion layer F 23 and the base wiring H 26 can be set into a floating potential.
- the base diffusion layer F 23 and the base wiring H 26 may be alternately arranged side by side, or may be arranged so as to overlap with each other.
- the base diffusion layer F 23 and the base wiring H 26 are provided as the base layers of the resistors R 21 A, R 21 B, and R 21 C, uniformity in coarseness and fineness of a pattern of the base layer of each of the resistors R 21 A, R 21 B, and R 21 C can be improved.
- the lower-layer wirings H 21 A, H 21 B, and H 21 C are formed through a damascene process, embedded portions of the lower-layer wirings H 21 A, H 21 B, and H 21 C can be prevented from dishing, and a film thickness of each of the lower-layer wirings H 21 A, H 21 B, and H 21 C can be uniformly provided, so that values of the resistors R 21 A, R 21 B, R 21 C can be prevented from varying.
- the potentials of the base diffusion layer F 23 and the base wiring H 26 are set into the floating potential, parasitic capacity between the resistors R 21 A, R 21 B, and R 21 C and the base layers can be reduced, so that signal transmission speed can be improved.
- FIG. 7 is a plan view illustrating a configuration example of P-type transistors and resistors in an ODT circuit applied to a semiconductor device according to a fifth embodiment.
- the base diffusion layer F 23 in FIG. 6A has been removed, and the base wiring H 26 is provided as the base layer of the resistor R 21 A, R 21 B, and R 21 C.
- the parasitic capacity between the resistors R 21 A, R 21 B, and R 21 C, and the base diffusion layer F 23 can be eliminated, so that the signal transmission speed can be improved.
- FIG. 8A is a cross-sectional view illustrating a system configuration of a semiconductor device according to a sixth embodiment
- FIG. 8B is a block diagram illustrating a connection condition of an ODT circuit 11 A of a semiconductor chip PE 0 in FIG. 8A
- FIG. 8C is a block diagram illustrating a connection condition of an ODT circuit 11 B of each of the semiconductor chips PE 1 to PE 7 in FIG. 8A .
- a circuit board BD is provided in a package PK, and the semiconductor chips PE 0 to PE 7 are mounted on the circuit board BD.
- IO terminals BP are provided on a back surface of the circuit board BD.
- the semiconductor chip PE 0 includes a pad electrode D 1 A, the ODT circuit 11 A, an output buffer 12 A, a protective resistor R 0 A, and an input circuit 13 A.
- the ODT circuit 11 A includes a P-type transistor P 1 A, an N-type transistor N 1 A, and resistors R 1 A and R 2 A.
- the output buffer 12 A includes a P-type transistor P 2 A and an N-type transistor N 2 A.
- the pad electrode D 1 A is connected to the ODT circuit 11 A through a wiring SA drawn out from the pad electrode D 1 A.
- Each of the semiconductor chips PE 1 to PE 7 includes a pad electrode D 1 B, the ODT circuit 11 B, an output buffer 12 B, a protective resistor R 0 B, and an input circuit 13 B.
- the ODT circuit 11 B includes a P-type transistor P 1 B, an N-type transistor N 1 B, and resistors R 1 B and R 2 B.
- the output buffer 12 B includes a P-type transistor P 2 B, and an N-type transistor N 2 B.
- the pad electrode D 1 B is separated from the ODT circuit 11 B because a wiring SB drawn out from the pad electrode D 1 B is cut.
- the resistors R 1 A, R 2 A, R 1 B, and R 2 B may have the same configurations as those shown in FIG. 3A , FIG. 4 , FIG. 5A , FIG. 6A or FIG. 7 .
- the semiconductor chips PE 0 to PE 7 are stacked so as to be shifted in position so that the pad electrodes D 1 A and D 1 B are exposed.
- the pad electrodes D 1 A and D 1 B are connected to the IO terminals BP through bonding wires WL to be connected to the same channel.
- the IO terminal BP is connected to the controller 3 through the transmission line 2 .
- the P-type transistors P 2 A and P 2 B, and the N-type transistors N 2 A and N 2 B are turned off.
- the P-type transistor P 1 A and the N-type transistor N 1 A are turned on, so that the pad electrodes D 1 A and D 1 B are set to the middle potential between the power supply potential VCC and the ground potential GND.
- the impedance matching with the transmission line 2 can be achieved.
- the signals inputted to the pad electrodes D 1 A and D 1 B through the transmission line 2 can be prevented from being reflected, and the signals can be efficiently transmitted.
- the upper and lower limits of the signals inputted to the pad electrodes D 1 A and D 1 B through the transmission line 2 can be limited by the resistors R 1 A and R 2 A, so that the signal can be reduced in amplitude.
- an IO pad of the semiconductor chip having the ODT element is heavier in capacity (CL) than that of the IO pad of the semiconductor chip not having the ODT terminal by about 30%.
- CL capacity
- the IO pad cannot be driven at high speed, so that transfer efficiency of IO data is reduced.
- the pin capacity CIO 1 of the one IC terminal in the package is expressed by the following equation.
- CIO 1 package wiring capacity+capacity of chip with ODT(1.3 ⁇ CL ) ⁇ 8
- pin capacity CIO 2 of the one IO terminal in the package is expressed by the following equation.
- FIG. 9 is a cross-sectional view illustrating a system configuration of a semiconductor device according to a seventh embodiment.
- a circuit board BDA is provided in a package PKA, and semiconductor chips PA 0 to PA 7 are mounted on the circuit board BDA.
- IO terminals BPA are provided on a back surface of the circuit board BDA.
- a pad electrode of each of the semiconductor chips PA 0 to PA 7 is connected to the IO terminal BPA through a bonding wire WLA to be connected to the same channel.
- this package PKA has the same configuration as that of the package PK in FIG. 8 .
- a circuit board BDB is provided in a package PKB, and semiconductor chips PB 0 to PB 7 are mounted on the circuit board BDB.
- IO terminals BPB are provided on a back surface of the circuit board BDB.
- a pad electrode of each of the semiconductor chips PB 0 to PB 7 is connected to the IO terminal BPB through a bonding wire WLB to be connected to the same channel.
- Each of the semiconductor chips PB 0 to PB 7 includes the pad electrode D 1 B, the ODT circuit 11 B, the output buffer 12 B, the protective resistor R 0 B, and the input circuit 13 B provided in FIG. 8C .
- the pad electrode D 1 B is separated from the ODT circuit 11 B by cutting the wiring SB drawn out from the pad electrode D 1 B.
- the IO terminals BPA and BPB are connected to the controller 3 through the transmission line 2 , whereby the same channel configuration is provided between the packages PKA and PKB.
- the P-type transistors P 2 A and P 2 B, and the N-type transistors N 2 A and N 2 B are turned off.
- the P-type transistor P 1 A and the N-type transistor N 1 A are turned on, so that the pad electrodes D 1 A and D 1 B are set to the middle potential between the power supply potential VCC and the ground potential GND.
- the impedance matching with the transmission line 2 can be achieved.
- the signals inputted to the pad electrodes D 1 A and D 1 B through the transmission line 2 can be prevented from being reflected, and the signals can be efficiently transmitted.
- the upper and lower limits of the signals inputted to the pad electrodes D 1 A and D 1 B through the transmission line 2 can be limited by the resistors R 1 A and R 2 A, and the signal can be reduced in amplitude.
- the ODT circuit 11 A is shared by the pad electrodes D 1 A and D 1 B of plural package of PKA and PKB, so that capacity of the ODT circuit 11 B added to the pad electrode D 1 B in the plural package of PKA and PKB can be eliminated, so that pin capacity of the IO terminals BPA and BPB can be reduced.
- FIG. 10 is a cross-sectional view illustrating a system configuration of a semiconductor device according to an eighth embodiment.
- the circuit board BDA is provided in the package PKA, and the semiconductor chips PA 0 to PA 7 are mounted on the circuit board BDA.
- the IO terminals BPA are provided on the back surface of the circuit board BDA.
- the pad electrode of each of the semiconductor chips PA 0 to PA 7 is connected to the IO terminal BPA through the bonding wire WLA to be connected to the same channel.
- a circuit board BDC is provided in a package PKC, and semiconductor chips PC 0 to PC 7 are mounted on the circuit board BDC.
- IO terminals BPC are provided on a back surface of the circuit board BDC.
- a pad electrode of each of the semiconductor chips PC 0 to PC 7 is connected to the IO terminal BPC through a bonding wire WLC to be connected to the same channel.
- packages PKA and PKC have the same configuration as that of the package PK in FIG. 8 .
- the IO terminals BPA and BPC are connected to the controller 3 through the transmission line 2 , whereby the same channel configuration is provided between the packages PKA and PKC.
- the P-type transistor P 1 A and the N-type transistor N 1 A in the semiconductor chip PA 0 in the package PKA are turned off, and the P-type transistor P 1 A and the N-type transistor N 1 A of the semiconductor chip PC 0 in the package PKC are turned on, so that the pad electrodes D 1 A and D 1 B of the semiconductor chips PC 0 to PC 7 in the package PKC are set to the middle potential between the power supply potential VCC and the ground potential GND.
- the impedance matching with the transmission line 2 can be achieved. Therefore, the signal inputted to the pad electrodes D 1 A and D 1 B in the package PKC through the transmission line 2 can be prevented from being reflected, and a reflected wave from the side of the package PKC can be prevented from being inputted to the side of the package PKA, so that the signal on the side of the package PKA can be efficiently transmitted.
- the P-type transistor P 1 A and the N-type transistor N 1 A in the semiconductor chip PC 0 in the package PKC are turned off, and the P-type transistor P 1 A and the N-type transistor N 1 A of the semiconductor chip PA 0 in the package PKA are turned on, so that the pad electrodes D 1 A and D 1 B of the semiconductor chips PA 0 to PA 7 in the package PKA are set to the middle potential between the power supply potential VCC and the ground potential GND.
- the impedance matching with the transmission line 2 can be achieved. Therefore, the signal inputted to the pad electrodes D 1 A and D 1 B in the package PKA through the transmission line 2 can be prevented from being reflected, and the reflected wave from the side of the package PKA can be prevented from being inputted to the side of the package PKC, so that the signal on the side of the package PKC can be efficiently transmitted.
Abstract
Description
CIO1=package wiring capacity+capacity of chip with ODT(1.3×CL)×8
CIO1=1.3×CL+1.3×CL×8=1.3×CL×9=11.7×CL
CIO2=package wiring capacity+capacity of chip without ODT(CL)×7+capacity of chip with ODT(1.3×CL)=1.3×CL×2+CL×7=9.6×CL
Claims (19)
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Office Action issued May 12, 2015 in Taiwanese Patent Application No. 102138309 (with English language translation). |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US20170179841A1 (en) * | 2015-12-22 | 2017-06-22 | Thermatool Corp. | High Frequency Power Supply System with Closely Regulated Output for Heating a Workpiece |
US10855194B2 (en) * | 2015-12-22 | 2020-12-01 | Thermatool Corp. | High frequency power supply system with closely regulated output for heating a workpiece |
Also Published As
Publication number | Publication date |
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CN104282654A (en) | 2015-01-14 |
CN104282654B (en) | 2017-12-19 |
US20150008582A1 (en) | 2015-01-08 |
TW201503316A (en) | 2015-01-16 |
TWI525788B (en) | 2016-03-11 |
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